Thermostat



FIG. 1 is a right front perspective view of a thermostat showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a front elevational view of another embodiment of my new design of FIG. 1, all other views being substantially similar to FIGS. 1-4, the rear of both embodiments being substantially flat, plain, and conventional. 

The ornamental design for a thermostat, as shown and described. 